EXHAUST AFTERTREATMENT SYSTEMS FOR GASOLINE AND ALTERNATIVE-FUELED ENGINES, WITH REDUCTION OF HC, CO, NOx, AND PM

a technology of exhaust aftertreatment and gasoline, which is applied in the direction of engines, machines/engines, mechanical equipment, etc., can solve the problems of no pm emission regulation, small diameter pm is more harmful to health, and the improvement of emissions has not met the emission limi

Active Publication Date: 2010-11-25
SOUTHWEST RES INST
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  • Claims
  • Application Information

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Problems solved by technology

Approaches to reducing emissions include improved in-cylinder combustion designs or fuel modifications, but these improvements have fallen short of meeting emissions limits.
However, for spark-i...

Method used

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  • EXHAUST AFTERTREATMENT SYSTEMS FOR GASOLINE AND ALTERNATIVE-FUELED ENGINES, WITH REDUCTION OF HC, CO, NOx, AND PM
  • EXHAUST AFTERTREATMENT SYSTEMS FOR GASOLINE AND ALTERNATIVE-FUELED ENGINES, WITH REDUCTION OF HC, CO, NOx, AND PM
  • EXHAUST AFTERTREATMENT SYSTEMS FOR GASOLINE AND ALTERNATIVE-FUELED ENGINES, WITH REDUCTION OF HC, CO, NOx, AND PM

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[0014]The following description is directed to emissions aftertreatment systems for use in the exhaust system of a spark-ignited engine. Examples of spark-ignited engines other than gasoline engines are alternative-fueled engines, such as engines fueled by compressed natural gas (CNG), liquefied natural gas (LNG), liquefied petroleum gas (LPG), ethanol, methanol, gas-to-liquid fuel, and coal-to-liquid fuel, and others.

[0015]Typical applications of the exhaust aftertreatment systems described herein are with vehicles, such as automobiles, which have an engine compartment, a driver / passenger compartment with a floor above the axles and wheels, and an under-floor tailpipe. The aftertreatment systems described herein simultaneously reduce emissions of hydrocarbon (HC), carbon monoxide (CO), oxides of nitrogen (NOx) and particulate matter (PM).

[0016]FIG. 1 illustrates a spark-ignited engine system, generally identified as 10, having a “close-coupled” emissions treatment device 101 and an...

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Abstract

An exhaust gas emissions aftertreatment system for spark-ignition engines, which simultaneously reduces the particulate matter, HC, CO, and NOx content of the exhaust. Various embodiments of the system have both a closely-coupled TWC device, and an under-floor treatment device. The under-floor device has either TWC or NOx reduction functionality, depending on whether the engine is run under stiochiometric or lean burn operating conditions.

Description

TECHNICAL FIELD OF THE INVENTION[0001]This invention relates to reducing harmful exhaust emissions from gasoline and alternative-fueled engines, and more particularly to exhaust aftertreatment systems for such engines that address particulate emissions in addition to gaseous emissions.BACKGROUND OF THE INVENTION[0002]Internal combustion engines used for both mobile and stationary applications are subject to strict emission limits. Approaches to reducing emissions include improved in-cylinder combustion designs or fuel modifications, but these improvements have fallen short of meeting emissions limits. Other approaches involve the use of exhaust aftertreatment devices, which have achieved significant emissions reductions.[0003]For diesel engines, particulate matter (PM) emissions are regulated in the United States and other developed nations. However, for spark-ignited engines, currently there are no regulations that address PM emissions. Spark-ignited engines may be either gasoline ...

Claims

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Application Information

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IPC IPC(8): F01N3/035
CPCF01N3/035Y02T10/24Y02T10/22F01N3/2066Y02T10/12Y02A50/20
Inventor ZHAN, RIJINGWEBER, PHILLIP A.
Owner SOUTHWEST RES INST
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